* c.opt: Add -Wnoexcept.
	* except.c (check_noexcept_r): Return the problematic function.
	(finish_noexcept_expr): Give -Wnoexcept warning.  Add complain parm.
	* pt.c (tsubst_copy_and_build): Pass it.
	* parser.c (cp_parser_unary_expression): Likewise.
	* cp-tree.h: Adjust prototype.

From-SVN: r160842